Abstract
If D is a digraph with n vertices then the energy of D is defined as E(D)=∑k=1n|Re(zk)|, where Re (z1),…, Re(zn) are the real parts of the eigenvalues z1,…,zn of D. In this paper we solve a problem proposed in Khan et al. (2015), we find the maximal value of the energy over the set of all bicyclic digraphs Bn with n vertices.
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